Iwan,
looks liek you will be building pillars from the rock you have. I have done similar stuff in my 600g and it has made the tank far more visually appealing, and more natural looking.
I made mine by drilling the rock and mounting on PVC pipe, are you using an epoxy to join the rocks?
Paul.
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Paul W Whitby Ph.D
President Central Okla. Marine Aq. Soc.
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